Add support for a managed user pref store to PrefService.

chrome/browser/prefs/pref_service_syncable.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/prefs/pref_service_syncable.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/prefs/default_pref_store.h"
 #include "base/prefs/overlay_user_pref_store.h"
@@ skipping 74 matching lines @@
   OverlayUserPrefStore* incognito_pref_store =
       new OverlayUserPrefStore(user_pref_store_.get());
   PrefsTabHelper::InitIncognitoUserPrefStore(incognito_pref_store);
 
   scoped_refptr<user_prefs::PrefRegistrySyncable> forked_registry =
       static_cast<user_prefs::PrefRegistrySyncable*>(
           pref_registry_.get())->ForkForIncognito();
   PrefServiceSyncable* incognito_service = new PrefServiceSyncable(
       pref_notifier,
       pref_value_store_->CloneAndSpecialize(NULL,  // managed
+                                            NULL,  // managed_user
                                             incognito_extension_prefs,
                                             NULL,  // command_line_prefs
                                             incognito_pref_store,
                                             NULL,  // recommended
                                             forked_registry->defaults().get(),
                                             pref_notifier),
       incognito_pref_store,
       forked_registry.get(),
       read_error_callback_,
       false);
@@ skipping 72 matching lines @@
 
 void PrefServiceSyncable::OnIsSyncingChanged() {
   FOR_EACH_OBSERVER(PrefServiceSyncableObserver, observer_list_,
                     OnIsSyncingChanged());
 }
 
 void PrefServiceSyncable::ProcessPrefChange(const std::string& name) {
   pref_sync_associator_.ProcessPrefChange(name);
   priority_pref_sync_associator_.ProcessPrefChange(name);
 }